Improvement in steam vacuum-pumps



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E. s. BLAKE.

PUMP.

STEAM VACUUM- Patented May 29,1877,

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STEAM VACUUM-PUMP.

Patented May 29,187.7.

EESEF .CNIL/M NAPETERS. PHOTO-LITMOGRAPMER. WASHINGTON. D. CA

UNITED IAxims PATENT Errea..

EARL S. BLAKE, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN STEAM VACUUM-PUMPS.

Specification forming part of Letters Patent No. 191,397, dated May 29, 1877;` application filed May 12, 1871.

To all whom it may concern Be it known that I, EARL S. BLAKE, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Vacuum-Pumps; and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable others skilled in the art to which my invention appertains to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in which- Figure 1 represents a vertical central section of a steam vacuum-pump embodying my said invention. Fig. 2 represents a sectional plan of the same, taken on the line a a, drawn across Fig. 1. Fig. 3 represents a sectional plan ofthe steam-chest, taken on the line b b, Fig. l. Fig. 4 represents a general plan or top View of the same. Fig. 5 represen ts a sectional elevation of the same, taken on the line what', drawn through Fig. 2; and Fig. 6 represents a central sectional elevation, taken on the line y y, drawn across Fig4 4.

Like letters of reference indicate like parts.

The object of my invention is to improve that class of steam vacuum-pumps now in use; and my invention consists in the arrangement of the several parts, as will be more fully understood by the following descriptionand claims.

In the drawing, A and A' representthe pumpcylinders, which are arranged in a vertical position upon a suitable bed, B, and in close proximity to each other, as shown in Fig. 1. C represents the steam-chest, arranged centrally upon the cylinders A A', and communicating with the steam-boiler (not shown) through an induction-pipe, C'. D is the cut-oit valve, arranged within the steam-chest, and so as to admit of a free and easy longitudinal reciprocating movement, and is provided on its upper surface with wings c c', located near its ends, and extending transversely across the steam-chest, as shown in Figs. 3 and 6. The ends of the said wings t against the side walls ofthe steam-chest, and the wings are located at the proper distance from the end of the valve to form chambers d d' between their outer surface and the end walls of the steam-chest, and are each of the proper height to leave a slight A chambers d and d'.

space between its upper edge and the lower surface of the upper Wall of the chest, through which the live steam leaks-into'the respective E and E' are steam-ducts formed in the cylinder-heads, and communicate, respectively, with the interior of the cyliuders through ports e e' and e" c', as shown in Fig. 1. F and F' are steam-chambers, located between the ducts E E' and the steam- Vchests, and communicating with the said ducts through suitable openings (not shown) and with the steam-chest through portsff' and vg g', as shown in Fig. 1.

G and G' are the water chambers or cellars, which are located under the lower cylinderheads. I is a suction-pipe, which communicates with the respective cellars through openings h, formed in the lower wall of the said cellars. J J are check-valves, arranged over the respective openings h, to prevent the Water receding from the cellars back into the suction-pipe. K K' are water-ducts, located under the respective cylinders A and A', and communicating at one end with said cylinders through openings i i', and at the opposite end with the discharge-pipe L through portsjj', formed through the upper wall of the ducts. M M' are check-valves, located over the ports jj', to prevent the receding of the water from thel discharge-pipe back into the ducts. N N are water-ducts located under the lower cylinder-heads, the duct N communicating at one end with cellar G' and at the opposite end with cylinder A through an opening,m, formed through the cylinder-heads, and the duct N' communicates at one end with cellar G and at the opposite end with cylinder A' through an opening, m', as shown in Fig. 2. O is a Water-duct, formed in the lower surface of the lower cylinder-beads, and communioatin g with the respective cellars G and G' through openings n n'. o o' are check-valves, arranged over the openings a a', to prevent the water from receding from the 'd uct 0 back into the cellars. I is an air-chamber communicating with the duct O, as shown in Fig. 6. R R'and S S are jet-cones permanently attached to the upper surface ot' the lower cylinder-heads, and communicating with the duct C, and are each provided at the upper end with an opening, r,

through which a jet of Water is forced -from ber.

the said duct O into the respective cylinders for condensing the steam therein. T T' and U U' are concaved deecting-plates perma nently attached to the lower surface of' the uppercylinder-heads, centrally under the ports e e' and e" 0"', as shown in Fig. l.

The operation of my improved pump is as follows: The cylinders A A' are first formed i by vbeing partly filled with Water, which flows into the respective water-ducts and cellars, filling the same and partly filling the airchambers. The cut-off valve being in the position shown in Fig. 1, the steam is then admitted into the steam-chest, when it flows through portsfandf' into chambers F F, and from thence into duct E, and through ports e e' into cylinder A, forcing the water from said cylinder through opening z' into duct K, and from thence into the discharge-pipe L through openingj. When the water in said cylinder falls below the points of the jet-cones R R' the pressure of' air in the air-cham ber forces a jet of water through each cone into the cylinder A, so as to produce a spray sufficient to condense the steam in said cylinder and in duct E and chambers F and d, reducing the pressure of steam in said chamber d, so as to bring it below the pressure of live steam in chamber d', when the cut-oft' valve is moved by the overbalanced pressure ot' steam in said chamber d', and so as to close ports f and f' and open ports g and g' when the steam flows through said ports g g' into chambers F F', and from thence into duct E' and through ports e" e"' into cylinder A', forcing the water from said cylinder through opening t' into duct K', and from thence into the dischargepipe L through openingj', and into the airchamber P through duct O, filling said cham- The water then ows through the suction pipe I into cellar G', and from thenceinto cylinder A through duct N and opening m, filling the vacuum in said cylinder, and when the Water escaping from cylinder A' falls below the points of the cones S S' the pressure of air in chamber P forces a jet of water through the said cones sufficient to condense the steam in cylinder A', duct E', chambers F' and d', when the overbalauced' pressure of live steam in chamber d again moves the cutoi' valve, closing ports g g' and opening ports ff', when the steam again enters cylinder A,

as before.

The object of the concaved deflecting-plates T 1" and U U' is to cause the steam, as it enters the respective cylinders, to be thrown upward against the cylinder-heads, and so as to pass above the entire column of water in the cylinders.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination, with the cylinders A A', ducts E E', chambers F F', and the steamchest 0,' provided with the ports ff' and g g', of the cut-o` valve D, arranged to alternately open and close said ports, and having the wings c and c' arranged to form the chambers d and d', substantially as and for the purpose specified.

2. The combination, with the cylinders AA A' and cellars G G', as described, of the airchamber P, ducts K K', N N', and O, ar-

ranged substantially in the manner and for the purpose set forth.

THOMAS T. LooMIs, N. H. SHERBURNE. 

